Remove more usages of Guava collections

1 files changed, 19 insertions, 4 deletions

diff --git a/src/main/java/org/zwobble/mammoth/internal/util/MammothSets.java b/src/main/java/org/zwobble/mammoth/internal/util/MammothSets.java
index a9658ce..87f7bbe 100644
--- a/src/main/java/org/zwobble/mammoth/internal/util/MammothSets.java
+++ b/src/main/java/org/zwobble/mammoth/internal/util/MammothSets.java
@@ -1,15 +1,30 @@
 package org.zwobble.mammoth.internal.util;
 
-import com.google.common.collect.ImmutableSet;
-
+import java.util.Collections;
+import java.util.HashSet;
 import java.util.Set;
+import java.util.stream.Collectors;
+
+import static java.util.Arrays.asList;
+import static org.zwobble.mammoth.internal.util.MammothIterables.stream;
 
 public class MammothSets {
     public static <T> Set<T> set() {
-        return ImmutableSet.of();
+        return Collections.emptySet();
     }
 
     public static <T> Set<T> set(T value1) {
-        return ImmutableSet.of(value1);
+        return Collections.singleton(value1);
+    }
+
+    @SafeVarargs
+    public static <T> Set<T> set(T... values) {
+        HashSet<T> set = new HashSet<>();
+        set.addAll(asList(values));
+        return set;
+    }
+
+    public static <T> Set<T> toSet(Iterable<T> iterable) {
+        return stream(iterable).collect(Collectors.toSet());
     }
 }